Objective The aim of this study is to compare two different methods for assessing LSS on MRI and study their reliability and intercorrelation. Methods On pretreatment MRI of 82 patients, two experienced radiologists independently classified level L2/ L3, L3/L4 and L4/L5 as no, relative or significant stenosis using both methods. Agreement was analyzed by weighted Kappa. The correlation between the two methods was analysed using Spearman correlation, and visualized in a box plot. Results The interobserver agreement (95 % CI) was 0.69(0.61-0.77) and 0.65 (0.56-0.74), respectively. The intraobserver agreements for DSCA were 0.77 (0.60-0.74) and 0.80 (0.66-0.93). On morphological grading A-D it was 0.78 (0.65–0.92) and 0.81 (0.68- 0.94). The correlationcoefficient between the two methods was 0.85 (p\0.001). Grades C and D were under the limit value for significant stenosis using the DSCA. Conclusion The study shows that the inter- and intraobserver agreements of DSCA and morphological grading A-D were acceptable and their intercorrelation is strong. Both methods may be used in the MRI evaluation of LSS.